Hot-air turn ace



T. H. MONAGHAN AND R- F- ,LINDEMAN.

HOT AIR FURNACE.

APPLICATION FILED NOV. I5, 1918.

1 ,323, 305. Patented6 Dec. 2, 1919.

' F- '2/ 2d FLUM/emam,

UNITED snares PATENT OFFICE.

THOMAS H. MON AGI-IAN AND REINHOLD F. LINDEMAN, OF CHICAGO, ILLINOIS.

HOT-AIR FURNACE.

Specification of Letters Patent. Patented Dec; 2,1919,

Application filed November 15, 1918. Serial No. 262,662.

To all whom it may concern:

Be it known that we, THOMAS H. MONA- err-m and RnINHoLn F. LINDEMAN, citizens of the United States, and residents of Chicago, Cook county, and State of Illinois, have invented certain new and useful 1111-, provements in Hot-Air Furnaces, of which the following is declared to be a full, clear, and exact description.

This invention relates to hot air furnaces and its primary object is to increase the ef ficiency of hot air furnaces; to provide a furnace by which great volumes of heated air may be supplied with a minimum expenditure of fuel, and to provide a furnace 'in which great volumes of heated air may be supplied in a short space of time. This hot air furnace is intended particularly for use in foundries, shops, cantonments and other like spacious structures, and because of the rapidity with which hot air may be circulated with the present furnace, a less number of furnaces may be employed in a given space than has heretofore been possible to employ and the heat may be distributed more uniformly and more rapidly than heretofore. The invention consists in the several novel features hereinafter fully set forth and claimed:

The invention is clearly 'illustratd in the drawing accompanying this application, in which:

Figure 1, is a vertical section taken through a furnace embodying one form of the present invention, the line of section being indicated at 1-1 in Fig. 2, and Fig. 2, is a plan of'the furnace partly broken out.

Referringto said drawing, the reference character 3 designates a casing which may be of upright cylindrical form, provided near its bottom with an annular opening 4, which comprises the air inlet to the heating chambers of the furnace. The upper and lower sections of the casing may be separated and connected by struts 5, formed of angle iron or othersuitable material riveted to the sections.

Within the lower portion of the section 3, is a-fire pot 6, below which is an ash pit 7 and above the fire pot is an annular wall 8, which provides a combustion chamber above the fire pot. Door openings 9, 1O closed by suitable fire and ash doors are provided for the combustion chamber and ash piterespectively. -The top of the combustion chamber is closed by a top plate 1 1, and extending up from said plate 11, are smoke fiues 12, which extend to a partition 13, which is secured to the casing 3, and separates the air chamber 14, (which is formed between the top plate 11, and the partition 13) from .ahot air chamber 15, located between said partition 13, and the top '16 of the furnace. 13, is a. smoke drum 17, which may have a dome 18, at its upper end, from which *rises the main smoke flue or smoke stack 19. Below the air inlet 1, is a wall or partition 20, whichseparatesor isolates the air inlet from the ash pit or parts below the fire pot, and an annular bafile plate 21, is secured to the casingabove the air inlet, and together with the wall or partition 20, provides an air passageway leading to the side of the fire pot, through which passageway the air must pass before entering the other air chambers of the-furnace. V V I The annular space between the combustion chamber, fire. pot and casing forms an air chamber 22, through which the air Above the partition passes on its way to the air chamber l hand at the top of said airchamber 22, is a baffle plate 23, which issecured .tothe casing 3,

and is formed with arr-opening 24., which .is

eccentrically disposed with respect to the top plate 11 thereby providing'a-substantially crescent shapedopening 24, thegreate est width ofwhich is: located adjacentone side of the furnace; V p

At the side-of the furnace, opposite the, greatest width of the opening 24, is an exhaust fan or blower 25, which may be secured to said casing in any suitable manher and it is here shown as supported upon posts 26. The inlet"27,ofthe casingof said exhaust fan or blower communicates with the airchamber 14, and its discharge opening 28, communicates with the air chamber 15,

at the top of the furnace. The shaft 29, of said-fan .or blower may be driven .by any less belt, chain or the like as may bedesired. The partition 13, completely separates the chambers 14;, 1 5 from each other, except that a passageway is left through the exhaust fan orv blower 25, through which the ..air

10o suitable means, as for instance, a motor,ende

must pass. .Hot air discharge pipes .30,

open out from the air chamber15, and discharge the hot air. from the furnace.

In the pperation 'i'of this ..furnace, the,

products of combustion pass up through the smoke fines 12, enter the smoke drum 17, and finally pass out through the smoke stack 19; a large hot surface area is thereby presented to all three air chambers. The fan of the exhaust fan or blower 25 being set in motion, air is taken in through the air inlet 4:, passes up around the outer hot surfaces of the fire pot and combustion chamber and because of the shape of the air passage or opening 242, the greater volume of the air is conducted past said fire pot and combustion chamber toward the Wider part of said opening 24 after which it passes through the air chamber 14, in an approximately horizontal direction toward the intake side 27, of the exhaust fan or blower 25. The smoke fines 12, are preferably arranged in staggered fashion as seen in Fig. 2, and as a result thereof, the air coming into the air chamber 14:, and particularly that coming in through the larger portions of the opening 24, must pass between and around the staggered smoke fines thereby coming in contact with their hot surfaces. The hot air which comes from the air chamber 14, is discharged by the exhaust fan or blower into the hot air chamber 15, where the heated air comes in contact with the drum 17, and is re-heated and discharged through the discharge pipes 30.

From the above it is obvious that the air as it passes through the chambers 22, 1d and 15, absorbs a greatdeal of heat radiated from the hot surfaces of the fire pot, combustion chamber, smoke fines and smoke drum, and because of the rapid circulation of the air through said chambers, great quantities of hot air are delivered from the discharge openings 30.

More or less variation of the. exact details of construction is possible without departing from the spirit of this invention. We desire, therefore, not to limit ourselves to th exact form of the construction shown and described, but intend, in the following claims, to pointout all of the invention disclosed herein.

We claim as'new and desire to secure by Letters Patent:

1. A hot air furnace, comprising, in combination, a casing having an air inlet adjacent its lower end and air discharge outlets adjacent its upper end, and provided with a plnrality of hot air chambers, a combustion chamber in one of said air chambers, a series of smoke fines extending from said combustion chamber through a second air chamber,

there being an indirect air passageway between two of said hot air chambers, and an exhaust fan interposed in said indirect air passageway and having an inlet opening, communicating with one of said air chambers and a discharge opening communicating with another of said airchambers, said air discharge outlets opening outwardly from said last mentioned air chambers.

2. A hot air furnace, comprising, in combination, a casing having an air inlet adjacent its lower end and air dischaiige outlets adjacent its upper end, said casing bein divided into a plurality of hot air chambers, two of which are directly connected by an air passageway and two of which are inclirectly connected by an air passageway, a combustion chamber in one of said hot air chambers, smoke fines extending up from said combustion chamber and passing through a second hot air chamber, a smoke drum in a third hot air chamber, communicating with said smoke fines, and an exhaust fan interposed in said indirect air passageway and having its intake end opening to the second mentioned hot air chamber and its discharge end opening to said third mentioned hot air chamber, said air discharge outlets opening outwardly from said third mentioned hot air chamber.

A hot air furnace, comprising, in combination, a casing having an air inlet adjacent its lower end and air discharge outlets adjacent its upper end, said casing bein divided into a plurality of hot air chambers,-

two of which are directly connected by a crescent shaped air passageway and two of which are indirectly connected by an air passageway, a combustion chamber in one of said hot air chambers, smoke fines extending up from said combustion chamber and passing through a second hot air chamber, a smoke drum in a third hot air chamber, communicating with said smoke fines, and

an exhaust fan interposed in said indirect air passageway and having its intake end opening to the second mentioned hot air chamber at the side opposite the widest part of the crescent shaped opening and its discharge end opening to said third mentioned hot air chamber, said air discharge outlets opening outwardly from said third men-- 7 t1oned hot a1r chamber.

4. A. hot air furnace, comprising, in combination, a casing havin an annular air inlet adjacent its lower en an annular bafiie plate thereabove, and air discharge outlets adjacent its upper end, said caslng being divided into a plurality of hot air chambers, two of which are directly connected by an air passageway and two of which are indirectly connected by an air passageway, a combustion chamber in one of said hot air chambers, smoke fines extending up from said combustion through a second hot air chamber, a smoke drum in a third hot air chamber, c0mmunicating with aid smoke fines, and an exhaust fan interposed in said indirect air passageway and having its intake end opening to the second mentioned hot air chamber and its discharge end opening to said third men-- chamber and passing tioned hot air chamber, said air discharge outlets opening outwardly from said third mentioned hot air chamber.

5. A hot air furnace, comprising, in combination, a casing having an air inlet adjacent its lower end and air discharge outlets adjacent its upper end, said casing being divided into a plurality of hot air chambers, two of which are connected by an air spassageway and two of which are indirectly connected by an air passageway, a combustion chamber in one of said hot air chambers, smoke fiues extending up from said combustion chamber in staggered relation and passing through a second hot air chamber, a smoke drum in a third hot air chamber, communicating with said smoke flues and an exhaust fan interposed in said indirect air passageway and having its intake end open ing to the second mentioned hot air chamber and its discharge end opening to said third mentioned hot air chamber, said air discharge outlets openin outwardly from said third mentioned hot air chamber.

6. A hot air furnace, comprising, in combination, a casing having an air inlet adjacent its lower end and air discharge outlets adjacent its upper end, said casing bein g divided into a plurality of hot air chambers, two of which are directly connected by an air passageway and two of which are indirectly connected by an air passageway, a combustion chamber in one of said hot air chambers, smoke fines extending up from said combustion chamber and passing through a second hot air chamber, a smoke passage in .a third hot air chamber, communicating with said smoke fines, and an exh'aust fan interposed in said indirect air passageway and having its intake end opening ,to the second mentioned hot air chamber and its discharge end opening to said third mentioned hot air chamber, said air dis charge outlets opening outwardly from said third mentioned hot air chamber.

THOMAS H. MONAGHAN. REINHOLD F. LINDEMAN. 

